Worked on enhancing fluid handling robustness in the GregTech-Modern repository, focusing on preventing invalid fluid interactions and improving gameplay reliability. Addressed a bug by refining how fluids are identified and validated across containers, taking into account properties such as acidity, state (gas or plasma), and temperature. Implemented container-level proofing checks to ensure only suitable fluids are transferred, reducing edge-case failures and user-reported anomalies. Utilized Java and object-oriented programming principles, along with API integration, to deliver a targeted fix that improved acid-proof container behavior. These changes contributed to smoother gameplay and reduced support overhead by strengthening fluid management systems.